Method of extracting mandrels from boiler-tube expanders.



- J. W. FAESSLER.

METHOD OF EXTRAOTING MANDRELS FROM BOILER TUBE EXPANDERS.

APPLICATION FILED OCT. 9, 1912.

1,133,014. Patented Mar. 23,1915.

JOHN w. FAESSLER, or MOIBERLY, MISSOURI.

METHOD or nxzrnao'rmc MANDRELS FROM BOILER-TUBE nxraxnans.

Specification of Letters Patent.

Patented Mar. 23, 1915.

Application filed October 9, 1912. Serial No. 724,835.

To all whom it may concern Be it known that I, JOHN W. FAEssLER, a citizen of the United States, and resident of Moberly, Randolph county, Missouri, have invented certain new and useful Improvements in Methods of Extracting Mandrels from Boiler-Tube Expanders, of which the following is a specification containing a full, clear, and exact description, reference being had to the accompanying drawings, formin a part hereof.

My invention relates to an improved method of extractin mandrels from boiler tube expanders, an consists in the novel steps of procedure hereinafter described and specifically pointed out in the appended claims. v

The object of my invention is to provide an improved method of extracting mandrels from sectional boiler tube expanders. in

order that the time of the operator will be greatly economized and the mandrel will bev promptly extracted without injury to either the mandrel or the sections of the expander.

Heretofore the mandrels of sectional boiler tube expanders have been extracted by delivering'side-wise blows of a hand hammer upon the side of the mandrel in order to loosen the same. and this is what I term the hand method; but the described hand method has not been satisfactory,

for the reason that it occupied a great deal ing the tube.

In order to extract the mandrel without injuring either the mandrel or the sections of the expander, 'I need not strike the mandrel 4, but on the other hand I strike the projecting ends of the sections 5 of the expander with any suitable tool and thereby virtually drive them off the mandrel.

For the purpose of striking the expander sections 5 to detach the mandrel 4, I preferably make use of a sleeve 6 adapted to loosely embrace the mandrel and having an arm 7 extended laterally therefrom to receive the impacts of a suitable hammer sov that part of the force of each impact will be imparted to the said sections 5. of the expander to loosen them from the mandrel and another part of the force of the impact will be imparted to the side of the mandrel to loosen the mandrel without damaging it. The said arm 7 is preferably shaped so that 1ts extractor 3 extends in a plane parallel with the sleeve. The hammer which I prefer to use is a common pneumatic hammer 8, the tool 9 of which is provided with a stem 10 which fits into the end of the body of the hammer.

The numeral 11 designates a rubber ring which embraces the sections 5 of the expander to yieldingly hold them in place. When assembled, these sections each engage one of the faces of the tapered polygonal portion 12 of the mandrel and their outersurfaces combined form substantially a shoulder of the proper shape to expand the tube 1 in the usual manner.

To extract the mandrel 4 the sleeve 6 is placed over themandrel, as shown, and the tool 9 of the pneumatic hammer is placed against the rounded end 13 of the extractor arm 7 and said hammer is started in the usual manner and caused to exert blows or shocks to the said arm, thereby driving the expander sections 5 away from the mandrel 4 and loosening the same. Each impact of the hammer forces the end of the sleeve 6 against the expander sections 5 and at the same time strikes aside blow against the said mandrel 4 and thereby also loosens the same. In some cases I may place the pneumatic hammer 8 directly against the outer end of said sleeve 6 and thereby simultaneously loosen all of the extractor sections from the mandrel. 4

I claim:

1. The herein described method of extracting mandrels from boiler tube expanders. which consists in delivering a series of blows (or shocks) upon the expandersections, and thereby bodily forcing the expander from the mandrel and simultaneously impacting the side of the mandrel.

delivering a series of blows (or shocks) name to this specification,inpresence of M10 upon the expander-sections, and thereby subscribing witnesses. bodily forcing all of the sections of the ex- JOHN W FAESSLER pander from the mandrel and simultaner v V 5 ously impacting the side of the mandrel v Witnesses:

with a. tool separate from said mandrel. CHAS. F. PALMER,

In testimony whereof, I have signed. my A E. L. WALLACE. 

